package cn.tedu.sp06.filter;

import cn.tedu.web.util.JsonResult;
import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

@Component
public class AccessFilter extends ZuulFilter {
    //pre,routing,post,error 过滤器类型
    @Override
    public String filterType() {
        return FilterConstants.PRE_TYPE;
    }
    //过滤器的顺序号
    @Override
    public int filterOrder() {
        //有5个默认的过滤器,自己的过滤器加到末尾
        return 6;
    }
    //针对当前请求,判断是否要执行过滤代码
    @Override
    public boolean shouldFilter() {
        //先获取当前请求的上下文对象
        RequestContext ctx = RequestContext.getCurrentContext();
        //当前请求,调用的服务ID
        String serviceId =
                (String) ctx.get(FilterConstants.SERVICE_ID_KEY);//"serviceId"
        //调用的是否 是 item-service
        return "item-service".equals(serviceId);
    }
    //过滤代码
    @Override
    public Object run() throws ZuulException {
        //获取上下文对象
        RequestContext ctx = RequestContext.getCurrentContext();
        //获得 Request 对象
        HttpServletRequest request = ctx.getRequest();
        //接收 token 参数
        String token = request.getParameter("token");
        //如果没有 token, 阻止继续调用,直接返回响应
        // "",null,"    "
        if(StringUtils.isBlank(token)){
            //阻止继续调用
            ctx.setSendZuulResponse(false);
            //直接返回响应
            // JsonResult --- {code:1,msg:xxx,data:null}
            ctx.addZuulResponseHeader(
                    "Context-Type","application/json;charset=UTF-8");
            ctx.setResponseBody(
                            JsonResult.err()
                            .code(400)
                            .msg("Not login!")
                            .toString());
        }
        return null; //当前 zuul版本中,这个返回值没有用

    }
}
